sudo: respect --login regardless of the presence of --chdir

[japaric]

closes #793

[codecov]

Codecov Report

Attention: 13 lines in your changes are missing coverage. Please review.

Comparison is base (5cf4857) 55.38% compared to head (7c1c0ca) 55.34%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #794      +/-   ##
==========================================
- Coverage   55.38%   55.34%   -0.04%     
==========================================
  Files          72       72              
  Lines        9833     9831       -2     
==========================================
- Hits         5446     5441       -5     
- Misses       4387     4390       +3     

Files	Coverage Δ
src/common/command.rs	91.72% <100.00%> (-0.17%)	⬇️
src/exec/mod.rs	0.00% <0.00%> (ø)

... and 2 files with indirect coverage changes

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